Clutch and brake with non-rotatable fluid operator



April 1968 R. E- MILLER ETAL CLUTCH AND BRAKE WITH NON-ROTATABLE FLUIDOPERATOR 6 Sheets-Sheet 1 Original Filed May 28, 1965 PD NIE w meL W O EI T A M e m m m. 4 R E W 20 R Y B W W w w. u .0 w W L J April 16, 1968R. E- MILLER ETAL 3,378,120

CLUTCH AND BRAKE WITH NON-ROTATABLE FLUID OPERATOR Original Filed May28, 1965 6 Sheets-Sheet INVENTORS E0 E. M/LLEE AND BY R0 -RT FMILILER 4TTOE/VEYS.

Apnl 16, 1968 R MLLER ETAL 3,378,120

CLUTCH AND BRAKE WITH NON-ROTATABLE FLUID OPERATOR Original Filed May28, 1965 6, Sheets-Sheet 5 INVENTORJ Rev E. MIL/.52, AND ROBERT F.MILLER A TTOe/VEYJi April 16, 1968 R. MILLER ETAL Original Fil ed May28, 1965 6 Sheets-Sheet 4 I29 /30 m I 2 K M 0:11: IL: :11: "::o /7

Bzn Exuaus? Den/- J? 35 a /9 57 59! l /9- I 1 I I EEG BRAKE VALVE a f+ Vcan:

BY ROBERT F. MILLER nrroemevs.

April 16, 1968 R MILLER ETAL- 3,378,120

CLUTCH AND BRAKE WITH NON-ROI'ATABLE FLUID OPERATOR Original Filed May28, 1965 6 Sheets-811591 i;

INVENTPORS Y E M/LAE/ZANO ROBERT FMILLER BY MQK/ April 16, 1968 MILLERETAL 3,378,120

CLUTCH AND BRAKE WITH NON-RCTATABLE FLUID OPERATOR Original Filed May28, 1965 6 Sheets-Sheet FIG. FIG. 15. /92

Q FIG. 16. 3 I 204 205 Ex m/ 11 INVENTORS MWU T United States Patent3,378,120 CLUTCH AND BRAKE WITH NfiN-ROTATABLE FLUID OPERATUR Roy E.Miller and Robert F. Miller, Meehanicsburg, Pa,

assignors to General Automated Machinery Corpor-ation, Camp Hill, Pin, acorporation of Pennsylvania Original application May 28, 1965, Ser. No.459,633. Divided and this application July 11, 1967, Ser. No. 652,6t39

4 Claims. (Cl. 192-14) ABSTRAQT OF THE DISCLUSURE The presentapplication is a divisional application of applicants co-pendingapplication Ser. No. 549,638 filed May 28, 1965 relative to a workcontrolled system for operating a sewing machine and associatedelements, and the present application is particularly concerned with anair operated combination clutch and brake unit having a driven shaft, adrive shaft, and plates for being alternately engaged to connect saidshafts or to stop the rotation of the driven shaft. A plate keyed, butslideably mounted on the driven shaft is slid in opposit directionstherealong by air operated pistons whereby said plate can engage a platecarried by the drive shaft or alternately a fixed plate for stoppingsaid driven shaft.

The principal object of the invention is to provide a system controlledby the advancing of a piece of work for operating a sewing machine andassociated elements for sewing the work piece and which system will, inthe proper order, start and drive the sewing machine, lower the presserfoot and thread cutoff, sever the thread at the completion of the sewingof one work piece and introduction of a second work piece to the sewingmachine, cool the needle, raise the prcsser foot and thread cut-off andstop the sewing machine solely through the feeding of the Work pieceduring the sewing thereof.

it is a further important object of the invention to provide an airoperated combination clutch and brake in a unit which is quick in itsoperation, is rugged and long lasting, is relatively economical toproduce, is compact requiring a minimum amount of space, can be readilyassembled or disassembled without requiring special skill or tools andyet can be quickly and easily connected to various types of drivingmeans and out-put elements.

Further objects of the invention will be in part obvious and in partpointed out in the following detailed description of the accompanyingdrawings in which:

FIG. 1 is a side elevation of a sewing machine with the present systemand clutch associated therewith.

FIG. 2 is an enlarged detail longitudinal sectional view of the presentclutch taken on line 2-2 of FIG. 1.

FIG. 3 is an enlarged front view of a switching unit providing part ofthe present system.

FIG. 4 is a side elevation of said switching unit taken from the rightof FIG. 3.

FIG. 5 is a top view of said switching unit.

FIG. 6 is a front elevation of the center plate of said switching unittaken along line 6-6 of FIG. 4.

FIG. 6a is a rear view of said center plate.

FIG. 7 is an elevation of the back of the front piece of said switchingunit taken along line 77 of FIG. 4.

FIG. 8 is an elevation of the back of the back plate of said switchingunit taken along line 38 of FIG. 4.

FIG. 9 i an enlarged detail cross-sectional view taken on line 9-9 ofFIG. 7 and showing a portion of said switching unit and a pressurelimiting valve forming a part thereof.

'ice

FIG. 10 is a diagrammatic view of the electrical and pneumatic system ofthe present invention.

FIG. 11 is an enlarged front elevation of the presser foot and threadcut-off forming a part of the invention.

FIG. 12 is an enlarged side elevation taken to the right of FIG. 11 andshowing the sewing machine head in broken lines.

FIG. 13 is a cross-sectional view taken on line 13-13 of FIG. 12.

FIG. 14 is a cross-sectional view taken on line fl t-i l of FIG. 13.

FIG. 15 is a view similar to FIG. 14, but with the thread pick-up andthread retainer in their down position.

FIG. 16 is an enlarged perspective view of the thread cutter plate.

FIG. 17 is a longitudinal sectional view of the control unit.

FIG. 18 is a top view of said control unit.

FIG. 19 is an enlarged cross-sectional view taken on line 19-4) of FIG.5, and;

FIG. 20 is an enlarged partial cross-sectional view taken on line 20-29of FIG. 3.

Referring now more particularly to the accompanying drawings in whichlike and corresponding parts are designated by similar referencecharacters, numeral 1 generally indicates a conventional lock stitchsewing machine, for example those employed in sewing parts of shoes suchas for example model 262 manufactured by the Singer Sewin Machine Co.and Union Special 51200 manufactured by the Union Special Machine (30.,mounted upon a base 2 having a drive shaft pulley 3 around which extendsan endless belt 4. Thread. 5 is fed to needle 6 adjacent presser footand thread cut-off 7 which is connected to the conventional resser footrod 8 and the resser foot lift mechanism controlled by cylinder 9 andcarried by the head of the sewing machine as will be described more indetail hereinafter.

Control unit generally indicated by 169 and individually shown in FIG.17 and 18 is mounted on base 2 and has a bar 11 pivotally mounted on oneend thereof extending across passageway 12. which passageway isconnected to tube 24.

An air tube 13 as shown in FIG. 1, l4 and 15 is connected to saidpresser foot and thread cut-off 7 for supplying cooler air thereto.

A combination clutch and brake unit 15 is mounted beheath base 2 and isconnected to an electric motor 16. Pulley 17 of said clutch and brakeunit has belt 4 passing therearound.

A switching unit 18 is also mounted beneath base 2 and is connected to acompressed air inlet pipe 19 which is connected to a source ofcompressed air not shown.

Tube 24 connects switching unit 18 with the clutch of said clutch andbrake unit while tube 21 connects unit 18 to the brake of unit 15. Tube22 connects unit it; to the presser foot lowering side of cylinder awhile tube 23 connects unit 13 to the presser toot raising side ofcylinder 9.

Tube 2 connects unit 18 to control unit passage 12 and tube 25 connectsunit 18 to air tube 13.

An electrical circuit 2-6 connects motor 16 to a source of electricalcurrent. Lines 27 and 28 are also connected to said circuit while line28 is connected to fuse 29, switch 30 and by line 46 to pilot light 45.Line 33 connects one pole of a microswitch 3 2 to line 43. Line 34 isconnected to line 27 and to one pole of solenoid 35 whose other pole isconnected to line 36 and pilot light 45. Line joins one pole of solenoid39 to line 44 and also line 37 connected to one pole of solenoid 38while the second poles of said solenoids 38 and 32 are connected bylines 41 and 42 to line 33.

Microswitch 32 is normally open and is closed by the upward movement ofa resilient diaphragm 48, see FIG. 19.

Control unit has a slotted base plate 49 adjustably mounted on base 2and includes a block 50 through which passageway 12 extends on adownward slant and through an opening in end recess 50 in which bar 11is pivotally positioned. A pin 52. extending through block 50 and bar 11pivotally connects the same. A thurnlb screw 53 extends through theslotted plate 49 and is in threaded engagement with base 2 foradjustably retaining plate 4-9 on base 2.

Switching unit 18 has three superimposed plates, front plate 53, centerplate 54 and back plate 55 held together by screws therethrough and baseplate 56 connected thereto by screws and also to base .2.

A tube 57 connects the bore 57a of solenoid 38 with opening 104 in saidfront plate. Tube 58 connects the bore 58a of solenoid 39 with opening106 of said front plate. An inlet pipe 59 connects air pipe 19 toopening 59a in back plate 55 and solenoid 35 is connected be tween pipes19 and 59 for controlling the air inlet and for at times exhausting airfrom pipe 59 to exhaust pipe 60.

Plates 55, 53 and 54 have a series of corresponding openings 61, 62 and63 through which screws extend for joining said plates together.

As shown in FIG. 9 plate 53 has a threaded stepped opening 64 into whichextends screw 65 having a threaded sh'ank 66 extending through opening67 in plate 54 into nipple 68 connected to tube 23. Said nipple 68 hasbores 69, 70 and 71 with exterior threads 72 for receiving aconventional tube connector for joining tube 23 thereto. A ring 73retains ball 74 in bore 69 against spring 75 While screw 66 adjusts theposition of said ball relative to ring 73. Similarly openings 76, 78 and79 in plate 53 have screws 64a, 65b, and 650 extending therein andthrough openings 81, 8 3, and 84 respectively in center plate 5 4 intovalved nipples similar to nipple 68 for tubes 21, 22 and 20 respectivelyconnected to and through back plate 55.

Front plate 53 has opening 87 connected to screw valve 88 connected totube 25 and which opening 87 coincides with oepning 86 in said centerplate.

Solenoid 39 has a center opening 89 and side opening 90 through plate 53while solenoid 38 has center opening '91 and side opening 92 throughsaid plate. Said openings 89, 90, 9 1, and 92 open into openings 93, 94,95, and 96 respectively of center plate 54.

Front plate opening 97 opens into piston 48 of said mircroswitch andopening 9 8 of center plate 54. As shown in FIG. 19 a slanting passage99 in front plate 53 is connected by recess 100 in said center plate toopening 98. Further, passage 99 opens into opening 102 of said frontplate coinciding with opening 103 of said center plate.

Opening 104 of said front plate has tube 57 connected thereto and opensinto opening 105 of said center plate. Opening 106 of said front plateis connected to tube 58 and opens into opening 107 of said center plateand tube 113 connected to said back plate.

Rubber rings such as 108 are embedded in the front of center plate 54around the openings as indicated in the drawing. The back of said centerplate has recesses 109, 110, 111, and 1 12 each joining openings 83, 84,8 5, and 96, openings 67, 81, 86, 82 and 94, openings 95 and 107 andopenings 103, 10 5, and 93 respectively with each recess as well asopening 98 being surrounded by a rubber ring 108 embedded in the back ofthe center plate.

As shown in FIG. 19 front plate opening 102 has a screw 114 threaded inbore 115 for controlling the end of passage 99.

The clutch and brake unit 15 shown in detail in FIG. 2 has an annularhousing 116 with air passage 1'17 connected to tube 21 and annularcylinder 1 18 in the end face of said housing. An annular piston 119 isslideably 4 mounted in cylinder 118 and has an annular extension '120.

A cylindrical cap 121 is fastened by bolts 122 to said housing end faceand within its bore 123 has a sealing ring 1'24 surrounding a ballbearing 125 with balls 126 riding on inner race 127 surrounding sleeve128 through which extends splined shaft 129 having a driven shaft 130exteriorly of the base 131 of cap 121 as a part thereof.

A roller bearing 132 embedded in base 131 rotatably supports one end ofshaft 129. Said base further has an annular cylinder 13 3 provided onthe inner face thereof in which is slideably positioned an annularpiston 134 having an annular extension 135. An air passage 136 connectedto tube 20 extends into cylinder 133 behind said piston 134.

Sleeve 128 has a peripheral flange 137 forming an inner stop for one endof race 127 and a ring 138 in threaded engagement with said sleeveholding said race against said stop. Said sleeve further has a lateralannular flange 139 positioned between an annular plate 140 ofconventional brake lining material fixedly connected in any conventionalmanner to housing 116 and similar annular plate 141 of brake liningmaterial fixedly connected in a similar manner to an annular block 142.

A ball bearing 143 is embedded in block 142 and has end 144 of shaft 129extending therein rotatably supporting that end of said shaft. A stubshaft 145 is rotatably supported by a roller bearing 146 embedded in cup147 fixedly connected to other end face of housing 116 by bolts 148. Thebase 149 of cap 147 has a drive shaft 150 extending from motor 16rotatably mounted therethrough of which stub shaft 145 is an extension.

Cap 131 has threaded opening 151 connected to tube 113 and their exhaustopenings 60, 58 and 91 of solenoids 35, 39 and 38 respectively. Opening151 opens in the cap bore 123 for feeding exhausted air to connectedpassages 133, 152, to 161 inclusive and and to threaded opening 171 incap 147 from which the air is exhausted.

Solenoids 35, 39 and 172 and 173 are conventional electrically operatedthree way solenoid air valves each with a strong spring, while solenoid38 is a conventional electrically operated three way solenoid air valvewith a relatively weak spring. Ports 60a, 57a, 58a, 178 and 179 as wellas 59b, 92, 90, 176 and 177 of said solenoids are normally open. Suchsolenoids can be solenoid air valves for example such as thosemanufactured by the Automatic Switch Company, Florham Park, New Jersey,Catalogue Nos. GX8314A33 and GX8314A51.

FIG. 20 of the drawings discloses in cross section the solenoid 38 byway of an example of the aforementioned solenoids 35, 39, 172 and 173which are similar to this solenoid 38. Said solenoid has electrical coil80 connected to lines 37 and 41 with a fixed tube 181 extending into thebore of said coil and having a bore 57a in communication with tube 57. Aslidable iron core 182 also extends within the bore of coil 180 in linewith tube 181 while a spring 182 tends to move said core from said coilagainst cup 184 fixedly mounted in plate 53, across opening 91 in saidcup. Said cup further has opening 92 which is in communication with bore57a in tube 181 due to a longitudinal groove 182a in the side wall ofcore 182. When coil 180 is electrically energized it draws core 182against tube 181 closing bore 57a and bringing openings 91 and 92 incommunication.

A knee control microswitch 185 is mounted upon a support for and belowtop 2. Said switch is connected by line 186 to one pole of both thecutofl. solenoid valve 172 and to foot lift solenoid 173 as well as toswitch 30 by line 187 and microswitch 32 by line 188. The other pole ofsaid solenoid valves 172 and 173 are connected by lines 187 and 34 topilot light 45. Said microswitch 185 is normally open and when closed bythe operator activates both said solenoids 172 and 173 opening port 174of solenoid 172 and closing ports 178 and 179 of both solenoids 172 and173.

Solenoid 172 has normally open port 178 in communication with tube andnormally open port 176 in communication with the down piston positioningside of the cutoff cylinder 189 and normally closed port 175 incommunication with both tube 21 and the up piston positioning side ofsaid cutoff cylinder 189.

Solenoid 172 has normally open port 179 in communication with tube 20and normally open port 177 in communication with the down pistonpositioning side of the foot lift cylinder 9.

The presser foot and thread cutoff '7 includes the presser foot body 190which has a vertical recess in which is slideably positioned the threadretainer 192 alongside of a pair of plates 193 and 194 with hooked endsand a spacer 195 therebetween providing the thread pickup. Said threadretainer 192 has a side slot 196 in line with slots 197 and 19 8 in thethread pickup plates in which is positioned an end 199 of an arm 200pivotally connected to said presser foot 'body. A curved rod 201 isfixedly connected to the other end of said arm and positioned for beingengaged by the piston rod 202 of said cutoff cylinder 189 for beingpushed downwardly to raise the thread retainer 192- and thread pick-upplates 193 and 194 into the presser foot body. A coil spring 203 isattached at one end to said presser foot body and bears against saidcurved rod to raise the same and thus lower the thread retainer andthread pick-up from said presser foot body. A thread cutting plate 204extends between the plates of said thread pickup and across said presserfoot body. A plate 205 encloses said elements within said presser footbody while a holder 206 fastened to said plate 205 retains said knifeplate in position within said presser foot body.

An L-shaped plate 207 supports cylinder 189 by bolts 209 and said plateis fastened to the end 208 of the sewing machine 1 by screws 210. AnL-shaped arm 211 is fixedly connected to plate 207 and extendsdownwardly therefrom and has a pin 212 upon which is pivotally mounted adog 213 which is held against base 2 by spring 214.

An arm 215 rotatably supports a roller 216 above base 2 on the innerside but to the rear of the presser foot and thread cutoff 7. A thumbscrew 217 extends through side arm 215 and is in threaded engagementwith base 2 permitting the adjustment of the position of said arm.

Cylinder 9 has the piston rod thereof connected to the conventionalpresser foot lifting mechanism, generally indicated in FIG. 1 in dottedlines at 218, of the sewing machine 1' and is thereby connected to rod 8for raising said rod 8 and thereby the presser foot and thread cutoff 7when said cylinder is activated.

In the operation of the present system screws to 65c inclusive areadjusted to move each ball 74 from its ring 73 to permit the correctamount of air to pass therethrough and this adjustment can be changedwhen found necessary.

The clutch and brake unit 15 has driven shaft 150 con tinuously rotatingwhen motor 16 connected thereto is energized when switch 26a is closed.

When compressed air from switching unit 18 passes through tube 21,piston 119 as shown in FIG. 2 moves projection against the outer race ofball bearing moving sleeve 128 to the right of FIG. 2 and flange 139against disc braking the rotation of driven shaft 130, stopping thesewing machine.

However, when the switching unit 18 directs the compressed air to tube20, piston 134 is moved to the left of FIG. 2 against the outer race ofball bearing 125 moving sleeve 128 and flange 139 to the left againstdisc 141 which is rotating with block 142 keyed to shaft being rotatedby shaft 150, causing shaft 129 and 130 to rotate therewith driving thesewing machine.

The space between flange 139 and disc 140 and 141 is very small so thatthe transition from brake to clutch engagement is very quickly carriedout. Sleeve 123 has a grooved bore into which the splines on splinedshaft 129 are slideably positioned permitting sleeve 128 to slidelongitudinally of shaft 129 for rotating therewith.

The housing of motor 16 and the clutch and brake unit 15 are joined withthe motor drive shaft being shaft or fixedly connected thereto. However,it is to be appreciated that other driving means such as internalcombustion engines or the like can be used for driving shaft 150 orconnected thereto by any conventional means. Clutch and brake unit 15can equally as well be used in other applications besides that ofoperating a sewing machine as described herein.

When switch 26a in lines 26 is closed it sends an electrical current tomotor 16 for operating the same. At such time if switch 30 is closed itactivates signal 45 and solenoid 35 closing port 60a thereof and openingport 19a to port 5% allowing compressed air from tube 19 to pass to tube59, openings 59a, 105 and 104, tube 57, solenoid 38, opening 92, 96,recess 109, openings 84 and 83 and tubes 21 and 23 stopping the sewingmachine and raising the presser foot 7, and also to the tube 24 forguide plate 11.

When a work piece such as a shoe is presented for sewing it is caused bythe operator to press against plate 11 and then beneath needle 6 forclosing passage 12 stopping the escape 0 fair increasing the pressurethereof whereupon the air enters openings 97 forcing piston 48 upwardly,closing microswitch 32 and completing the circuit to solenoids 38 and 39which changes the air passing therethrough closing openings 57a and 58aand opening openings 91 and 89 of both solenoids. Thus tube 21 isexhausted through solenoid 33 to tube 113 and air passes from opening 89to 9d of solenoid 39 to tube 20 closing the clutch and operating thesewing machine and also to ports 178 and 176 of solenoid 172 pushingdown the piston in the cut-off cylinder raising the thread retainer andthread pick-up in the presser foot and thread cut-01f 7, and 1177 ofsolenoid 173 to cylinder 9 raising the piston therein thus lowering thepresser foot and thread cut-off 7 onto the work piece.

When switches 26a and 30 are closed placing port 19a and 59a of solenoid35 in communication and closing port 60a thereof compressed airtherefrom passes through normally open ports 57a and 92 of solenoid 38to tube 21 stopping the sewing machine and to the tube 23 raising thefoot lift piston in cylinder 9 and also raising the piston in thecut-off cylinder 189. This raises the presser foot and thread cutoff aswell as lowering the thread retainer and thread pick-up in the saidpresser foot and thread cut-off.

Upon microswitch 32 being closed port 57a of solenoid 38 is closed andport 91 opened exhausting said solenoid, tube 21 and the piston raisingsides of said foot lift cylinder 9 and said cut-01f cylinder 189 andreleasing the brake. At the same time, port 58a of solenoid 39 is closedand port 89 thereof opened directing the air to tube 20 closing theclutch for operating the sewing machine, to the needle cooler tube 25,to ports 179 and 177 of solenoid 173 for moving the piston in cylinder 9downwardly lowering presser foot and thread cut-off 7 and also to port178 of solenoid 172 and through port 176 thereof to the down positioningside of the cutoff cylinder 189 raising the thread retainer and threadpickup of presser foot and thread cut-off 7 cutting the sewing thread.

At any time that the knee control microswitch is activated ports 178 and179 of solenoids 172 and 173 respectively are closed and port 174 ofsolenoid 172 opened.

Thus if microswitch 32 is closed when a shoe piece is against the frontguide 11 and the sewing machine is operating due to port 89 and 90 ofsolenoid 39 being opened and said knee operated microswitch 185 isactivated, ports 178 and 179 of solenoid 172 and 173 are closed whileport 174 of solenoid 172 is opened without effecting the piston in thecut-off cylinder 189.

However, if microswitch 32 is not closed and air is passing through port92 of solenoid 38 and the tube 21 stopping the operation of the sewingmachine and then the knee operated microswitch 185 is closed, air passesto port 176 and 174 of solenoid 172 and both sides of the piston of thecut-off cylinder 189 so that there is no change in the thread retainerand thread pickup of the presser foot and thread cut-off and also totube 23 to the up piston positioning side of cylinder 9 raising presserfoot and thread cut-off 7.

Of course, opening the knee control microswitch 185 again deenergizessolenoids 172 and 173 returning the system to its normally operatingcondition.

The present apparatus can be also employed by using tubing as asubstitute for the passageways of the switching unit 18.

The present apparatus is capable of considerable modifications and suchchanges thereto as come within the scope of the appended claims isdeemed to be a part thereof.

We claim:

1. A combination clutch and brake unit comprising a housing, a driveshaft extending into said housing, a driven shaft also extending intosaid housing, a pair of spaced apart parallel friction discs in saidhousing with one disc fixedly connected to said drive shaft for rotationtherewith and the other disc fixedly connected to said housing, a platepositioned between said discs, a sleeve slideably mounted on said drivenshaft and keyed thereto for rotation therewith, a bearing slideablypositioned in said housing and having said sleeve extending therethroughrotatably supporting said sleeve, stops carried by said sleeve onopposite sides of said bearing, said housing having a pair of cylinderseach on an opposite side of said bearing, a pair of pistons eachslideably positioned in one of said cylinders for abutting and pushingsaid bearing and thereby said sleeve and plate in opposite directionsand a controlled source of pressurized media connected to said cylindersfor moving one of said pistons at a time.

2. A combination clutch and brake unit comprising a housing consistingof a cylindrical center portion with a pair of caps each fixedlyconnected to an opposite end of said center portion and with an axialbore extending through said caps and center portion, a drive shaftextending through one of said caps axial bore, a driven shaft extendingthrough the other cap axial bore and the center portion axial bore, afriction disc fixedly connected to said drive shaft and laterallythereof, a second friction disc fixedly mounted in said center portionparallel to, but spaced from said first disc, a plate positioned betweensaid discs, a sleeve slideably mounted on said driven shaft and keyedthereto for rotation therewith and having said plate fixely mountedthereon, a bearing slideably mounted in said other cap and having saidsleeve extending therethrough for being rotatably supported thereby,means for preventing a longitudinal sliding movement between saidbearing and said sleeve, a cylinder provided in said center portionfacing one side of said bearing, a piston slideably mounted in saidcylinder for pushing said bearing, a second cylinder provided in saidother cap facing an opposite side of said bearing, a second pistonslideably mounted in said second cylinder for pushing said bearing in anopposite direction to said first piston, means for at times supplyingpressurized media to said first cylinder for moving the piston thereinagainst said bearing and means for supplying pressurized media to saidsecond cylinder at different times to said first mentioned supplyingmeans for moving said second piston against said bearing.

3. A combination clutch and brake unit as claimed in claim 2 wherein thebase of said cylindrical center portion is fixedly connected to saidother cap and has an annular groove facing said other cap providing saidfirst mentioned cylinder, said other cap has an annular groove in thebase thereof facing said center portion providing said second cylinderand said pistons are each of an annular configuration with an extensionextending towards said bearing.

4. A combination clutch and brake unit as claimed in claim 2 wherein ablock is fixedly mounted on said drive shaft and said first mentioneddisc is fixedly mounted on said block, a bearing is carried by saidblock and rotatably supports the inner end of said driven shaft and saidblock, plate and both discs are positioned within said cylindricalcenter portion.

References Cited UNITED STATES PATENTS 2,065,820 12/ 1936 Mellon.2,205,989 6/1940 Meyers et al. 3,182,528 5/1965 Lamburn 19218.1 XR3,174,350 3/1965 Hamish et al. 192-181 X BENJAMIN W. WYCHE 111, PrimaryExaminer.

